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ShaderParam.h
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ShaderParam.h
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#pragma once
#include <string>
#include <vector>
#include "Utilities/StrUtil.h"
#include "Utilities/types.h"
enum class FUNCTION
{
FUNCTION_DP2,
FUNCTION_DP2A,
FUNCTION_DP3,
FUNCTION_DP4,
FUNCTION_DPH,
FUNCTION_SFL, // Set zero
FUNCTION_STR, // Set One
FUNCTION_FRACT,
FUNCTION_DFDX,
FUNCTION_DFDY,
FUNCTION_REFL,
FUNCTION_TEXTURE_SAMPLE1D,
FUNCTION_TEXTURE_SAMPLE1D_BIAS,
FUNCTION_TEXTURE_SAMPLE1D_PROJ,
FUNCTION_TEXTURE_SAMPLE1D_LOD,
FUNCTION_TEXTURE_SAMPLE1D_GRAD,
FUNCTION_TEXTURE_SAMPLE2D,
FUNCTION_TEXTURE_SAMPLE2D_BIAS,
FUNCTION_TEXTURE_SAMPLE2D_PROJ,
FUNCTION_TEXTURE_SAMPLE2D_LOD,
FUNCTION_TEXTURE_SAMPLE2D_GRAD,
FUNCTION_TEXTURE_SHADOW2D,
FUNCTION_TEXTURE_SHADOW2D_PROJ,
FUNCTION_TEXTURE_SAMPLECUBE,
FUNCTION_TEXTURE_SAMPLECUBE_BIAS,
FUNCTION_TEXTURE_SAMPLECUBE_PROJ,
FUNCTION_TEXTURE_SAMPLECUBE_LOD,
FUNCTION_TEXTURE_SAMPLECUBE_GRAD,
FUNCTION_TEXTURE_SAMPLE3D,
FUNCTION_TEXTURE_SAMPLE3D_BIAS,
FUNCTION_TEXTURE_SAMPLE3D_PROJ,
FUNCTION_TEXTURE_SAMPLE3D_LOD,
FUNCTION_TEXTURE_SAMPLE3D_GRAD,
FUNCTION_VERTEX_TEXTURE_FETCH1D,
FUNCTION_VERTEX_TEXTURE_FETCH2D,
FUNCTION_VERTEX_TEXTURE_FETCH3D,
FUNCTION_VERTEX_TEXTURE_FETCHCUBE,
FUNCTION_TEXTURE_SAMPLE2D_DEPTH_RGBA
};
enum class COMPARE
{
FUNCTION_SEQ,
FUNCTION_SGE,
FUNCTION_SGT,
FUNCTION_SLE,
FUNCTION_SLT,
FUNCTION_SNE,
};
enum ParamFlag
{
PF_PARAM_IN,
PF_PARAM_OUT,
PF_PARAM_UNIFORM,
PF_PARAM_CONST,
PF_PARAM_NONE,
PF_PARAM_COUNT,
};
struct ParamItem
{
const std::string name;
const std::string value;
int location;
ParamItem(std::string _name, int _location, std::string _value = "")
: name(std::move(_name))
, value(std::move(_value)),
location(_location)
{ }
};
struct ParamType
{
const ParamFlag flag;
const std::string type;
std::vector<ParamItem> items;
ParamType(const ParamFlag _flag, std::string _type)
: flag(_flag)
, type(std::move(_type))
{
}
bool SearchName(const std::string& name) const
{
for (const auto& item : items)
{
if (item.name == name) return true;
}
return false;
}
};
struct ParamArray
{
std::vector<ParamType> params[PF_PARAM_COUNT];
ParamType* SearchParam(const ParamFlag &flag, const std::string& type)
{
for (auto& param : params[flag])
{
if (param.type == type)
return ¶m;
}
return nullptr;
}
bool HasParamTypeless(const ParamFlag flag, const std::string& name)
{
for (const auto& param : params[flag])
{
if (param.SearchName(name))
return true;
}
return false;
}
bool HasParam(const ParamFlag flag, const std::string& type, const std::string& name)
{
ParamType* t = SearchParam(flag, type);
return t && t->SearchName(name);
}
std::string AddParam(const ParamFlag flag, const std::string& type, const std::string& name, const std::string& value)
{
ParamType* t = SearchParam(flag, type);
if (t)
{
if (!t->SearchName(name)) t->items.emplace_back(name, -1, value);
}
else
{
params[flag].emplace_back(flag, type);
params[flag].back().items.emplace_back(name, -1, value);
}
return name;
}
std::string AddParam(const ParamFlag flag, const std::string& type, const std::string& name, int location = -1)
{
ParamType* t = SearchParam(flag, type);
if (t)
{
if (!t->SearchName(name)) t->items.emplace_back(name, location);
}
else
{
params[flag].emplace_back(flag, type);
params[flag].back().items.emplace_back(name, location);
}
return name;
}
};
class ShaderVariable
{
public:
std::string name;
std::vector<std::string> swizzles;
ShaderVariable() = default;
ShaderVariable(const std::string& var)
{
// Separate 'double destination' variables 'X=Y=SRC'
std::string simple_var;
const auto eq_pos = var.find('=');
if (eq_pos != umax)
{
simple_var = var.substr(0, eq_pos - 1);
}
else
{
simple_var = var;
}
const auto brace_pos = var.find_last_of(')');
std::string prefix;
if (brace_pos != umax)
{
prefix = simple_var.substr(0, brace_pos);
simple_var = simple_var.substr(brace_pos);
}
auto var_blocks = fmt::split(simple_var, { "." });
verify(HERE), (!var_blocks.empty());
name = prefix + var_blocks[0];
if (var_blocks.size() == 1)
{
swizzles.emplace_back("xyzw");
}
else
{
swizzles = std::vector<std::string>(var_blocks.begin() + 1, var_blocks.end());
}
}
size_t get_vector_size() const
{
return swizzles[swizzles.size() - 1].length();
}
ShaderVariable& simplify()
{
std::unordered_map<char, char> swizzle;
static std::unordered_map<uint, char> pos_to_swizzle =
{
{ 0, 'x' },
{ 1, 'y' },
{ 2, 'z' },
{ 3, 'w' }
};
for (auto& p : pos_to_swizzle)
{
swizzle[p.second] = swizzles[0].length() > p.first ? swizzles[0][p.first] : 0;
}
for (uint i = 1; i < swizzles.size(); ++i)
{
std::unordered_map<char, char> new_swizzle;
for (auto& p : pos_to_swizzle)
{
new_swizzle[p.second] = swizzle[swizzles[i].length() <= p.first ? '\0' : swizzles[i][p.first]];
}
swizzle = new_swizzle;
}
swizzles.clear();
std::string new_swizzle;
for (auto& p : pos_to_swizzle)
{
if (swizzle[p.second] != '\0')
new_swizzle += swizzle[p.second];
}
swizzles.push_back(new_swizzle);
return *this;
}
std::string get() const
{
if (swizzles.size() == 1 && swizzles[0] == "xyzw")
{
return name;
}
return name + "." + fmt::merge({ swizzles }, ".");
}
std::string match_size(const std::string& other_var) const
{
// Make other_var the same vector length as this var
ShaderVariable other(other_var);
const auto this_size = get_vector_size();
const auto other_size = other.get_vector_size();
if (this_size == other_size) [[likely]]
{
return other_var;
}
if (this_size < other_size) [[likely]]
{
switch (this_size)
{
case 0:
case 4:
return other_var;
case 1:
return other_var + ".x";
case 2:
return other_var + ".xy";
case 3:
return other_var + ".xyz";
default:
fmt::throw_exception("Unreachable" HERE);
}
}
else
{
auto remaining = this_size - other_size;
std::string result = other_var;
while (remaining--) result += "x";
return result;
}
}
std::string add_mask(const std::string& other_var) const
{
if (swizzles.back() != "xyzw")
{
return other_var + "." + swizzles.back();
}
return other_var;
}
};
struct vertex_reg_info
{
enum mask_test_type : u8
{
any = 0, // Any bit set
none = 1, // No bits set
all = 2, // All bits set
xall = 3 // Some bits set
};
std::string name; // output name
bool need_declare; // needs explicit declaration as output (not language in-built)
std::string src_reg; // reg to get data from
std::string src_reg_mask; // input swizzle mask
bool need_cast; // needs casting
std::string cond; // update on condition
std::string default_val; // fallback value on cond fail
std::string dst_alias; // output name override
bool check_mask; // check program output control mask for this output
u32 check_mask_value; // program output control mask for testing
mask_test_type check_flags; // whole mask must match
bool test(u32 mask) const
{
if (!check_mask)
return true;
const u32 val = (mask & check_mask_value);
switch (check_flags)
{
case none:
return (val == 0);
case any:
return (val != 0);
case all:
return (val == check_mask_value);
case xall:
return (val && val != check_mask_value);
default:
fmt::throw_exception("Unreachable" HERE);
}
}
bool declare(u32 mask) const
{
return test(mask);
}
};